Method of plating metals with aluminum



Patented July 31, 1928.

UNITED STATES PATENT OFFICE.

rnmz Joanne, or wrcxnnn-on-rnn-aunn, Gunman.

METHOD OF PLATIN METALS WITH ALUMINUM.

No Drawing. Application flle'd luiy 7, 1927, Serial No. 204,134, and inGermany February 11, 1828.

To plate iron and other metals in the form of sheets or strips, forinstance with aluminum', chiefi three methods have been employed hiterto. In the first thereof the sheets or strips of the metal to beplated are .covered at first preliminarily either on only one side or onboth sides with the plating metal, then the covered sheets or strips arepiled up, heated in common to the requisite temperature, and are thenpassed singly through arolling-mill. This method is obviously not acontinuous one, in thatit is interrupted between every 1 two consecutivesheets or strips, and there arises in consequence thereof waste at thefront edge and the rear edges of practically every sheetor strip. p

The second method proceeds in this way that the core metal is employedsolely in the form of strips, these are covered also either on only oneside or on both sides with the plating metal, then reeled up togetherwith it and finally. passed continuously through the rolling mill. Ashowever, the core metal is stretched differentlyv than the plating'metal, the different elongations cause folds and fractures in the one orthe other of the two metals, whereby numerous disturbances in theservice are caused and, besides, the product is rendered imperfect andnecessitates after-work in order to become suited for use.

The drawbacks adhering to said two methods have been overcome by thethird method which constitutes anessential progress over them. Also'inthis case the core -in continuous service practically endless stripshaving a length of'severalhundreds of meters, without any waste. 5

Butthis otherwise excellent method fails where the thickness of the coremetal surpasses a certain maximum limit, that is to .say, where itbecomes, owin to its thickness,

so stifi' that reeling it ofi an on causes great difiiculties; theseincrease with the breadth and thickness of'the strips and may becomeprohibitive. The method becomes pracmm. There are many cases in which. a

thicker core-metal is required, and in all these cases the method inquestion cannot be made use of.

Ndw, this drawback of thatmethod has been overcome b the presentinvention, according to whic the plating: metal is unwound from a reel,whereas the core-metal is used in the form of sheets or plates of anydesired thickness. These sheets or plates are introduced one after theother into the rolling mill, their. neighbouring edges being either incontact with each other or separated from each other only by small,immaterial gaps, and .the plating metal stri which is kept under tensioncontacts wit the core metal just when this is entering betwo metals maybe introduced into the roil- V ble to have them heated only in therolling ing mill in a heated state, but it is also possi mill itself bythe pressure to which they are sub'ected therein. In either case'aproduct I is o tained containing individual core plates and a continuousplating strip, or two such strips if said plates are plated on bothsides. The product may then be subdivided at the joints where the platesabut, also at other places, just as required, and the pieces may berolled in cold state a second timeuntil pose in view.

I claim: p

The method of coating metal plates comprising feeding through rollsupper and lower continuous aluminum strips unwound their thickness isthat necessary for the purfrom reels, introducing heated plates suc-- Icessively between the strips whereby both i strips and plates aresubjected to the'pressure of the rolls to effect intimate cohesion.between plates and strips whereby a continuous strip of compound metalstock is formed and separating the stock at points between the plates toform individual pieces of. coated metal.

l FRANZ JORDAN.

lot In testimony-whereof I afiix my signature.

